yes it looks like the only available option at the minute.
i think kates night mode is a great step in the right direction.
i emailed RIP DEV today about whether it would be possible to incude in a future update the ability to have the night mode specified hours also cover the 'shushing' of email notifications, i have to remember to mute my phone every night at 11pm and off again at 8am, suffice to say i forget sometimes either way and either get woken up or miss stuff in the morning.
i realize it shuts up calls and sms, but for me email is a noisy affair at night when "you got mail" bellows out loud at 4am!!
